Macapá is the capital of Amapá, and arguably the most deserted state capital of Brazil. As it sits north of the immensely wide mouth of the Amazon river, there are no highways leading out. Unless you count the road into French Guyana, that is.
Most flights connect in Belém. A taxi from the centre can be negotiated at R$ 15.
Boats from nearby Santana can take you to Belém(24 hours), Santarem (40 hours, hammock R$ 125, cabin R$ 250) and Manaus(5 days), among other smaller destinations.
There are buses to Oiapoque on the border of French Guyana. Travel time varies greatly with the rains though is approximately 11 hours in the dry season. 3 departures per day.
Apart from buses, mototaxis are the cheapest means to transport. A mototaxi from the bus station to the centre costs approximately 7 - 10 BRL (c. 15 BRL in a taxi). From the centre to the Monument to the Equator a taxi should cost approximately 5 BRL.
Marco Zero, (Right south of the city). Where the equator comes through, and even crosses a football stadium!edit There is a museum below the monument which has a short video available in English and Portuguese.
Fortaleza de Macapá. edit There are free guided tours available of the fort throughout the day (Portuguese Only).
restaurante Dona Flor, (road between Macapá and Santana). Very good. Right on the river. As you eat you can see the river and the people that live there.edit
There is a very good ice cream shop on the wharf near the Fort in the centre o town. At night there are many stalls along the sea front near the wharf that serve hamburgers, fried foods and regional fare.